I took HUMBLEKNIGHT's MK18 MOD1 and added a vertical foregrip with the grip taken from HUMBLEKNIGHT's Glock 19X. This does not really do anything other than look cool, but is does function as intended (albeit a bit too close to the receiver), and also as just a handstop. Included are the version with PEQ and holo, and just holo.
The author remixed this model.
Added vertical foregrip